I start with prog 0012. Use 3 notes and hear the arp do his job, release my hands from the keybord, sound fades out, select SEQ / ARP. , put the slider to off, put it back to on and the arp is dead. In the same way I cannot let the arp do his job within any program which had no arp before - unless I did an inbetween save or save as.
More I cannot say, sorry.
Hope this explains it for you.